Child resistant flip cap with collar

A container and closure device therefor, which comprises:

• (a) a container having a neck, an open top and a horizontal retainer track thereon, adapted to receive and rotatably affix a collar ring thereto;
• (b) a collar ring having a circular inside wall with a horizontal track thereon for attachment to the track of said container so as to connect said collar ring to said container so as to be horizontally and freely rotatable thereabout, said collar ring also having a top with a ledge thereon for frictionally engaging and retaining a cap, said ledge forming at least a horizontal arc track thereon of a predetermined length, for rotation of at least one protrusion of a cap to be rotated therein for a predetermined distance when frictional engagement is overcome, and said ledge having at least one cut out thereon to permit a cap to be inserted and removed from said collar ring;
• (c) a cap having semi-flexible walls and having at least one protrusion which corresponds to and has a geometry of adequate size to freely move through said at least one cut out of said ledge of said collar ring and to be rotatable within said horizontal arc track of said collar ring for a predetermined distance when frictional engagement is overcome, and such that when said cap is so inserted and rotated, said at least one protrusion also being of adequate size and geometry to cause frictional engagement between said cap and said ring and to cause simultaneous rotation of said cap and said collar ring when at least one of said cap and collar ring is rotated, and to prevent removal of said cap from said collar ring, except when said cap and said collar ring are held separately and are rotated relative to one another such that said at least one protrusion and said at least one cut out are in alignment for lift up removal of said cap from said collar ring;
• and,
• (d) a semi-flexible tether having a first end connected to said collar ring and having a second end connected to said cap, said tether having a rest position and a twisted position, said tether being connected to said collar ring and said cap at locations such that when said tether is in its rest position, said at least one protrusion is within said horizontal arc track of said collar ring, and said at least one protrusion and said at least one cut out are not in alignment, and such that when said cap is rotated relative to said ring and said tether is in a twisted position, said at least one cut out and said at least one protrusion are in alignment to permit lift up removal of said cap from said collar ring.